Players don't come cheap nowadays but there's good news this summer with a host of top defenders available on Bosman free transfers.

When the transfer window opens on July 1, bargain-hunting clubs will lock horns doing battle for the best of the freebies. And if your club plays its cards right you could sign up an entire new defence without paying out a single penny in transfer fees.

Sol Campbell's move from Tottenham Hotspur to hated rivals Arsenal remains one of the most memorable Bosmans in Premier League history. But while they can prove to be a cost effective way or bolstering your team, the competition is also fierce.

Here we take a look at some of the best defensive reinforcements which won't cost your club a penny in transfer fees.

Starting between the sticks, we take a look at 25-year-old goalkeeper Norberto Neto, a Brazilian playing in Serie A for Fiorentina.

The rather aptly named Neto has played a key role in the Viola's push for a Champions League spot this season and is still very young for a 'keeper.

The likes of both Inter and AC Milan in Italy, PSG and Monaco in France and Tottenham in England are said to be interested but Neto is likely to command the first team spot wherever he goes and Liverpool seems a more likely destination, as suggested by the Express.

Need back-up? Well another 'keeper who is also available on a free this summer is Bolton Wanderers' Adam Bogdan.

The Hungarian international looks likely to leave the Trotters when his contract is up this summer and like Neto he has been linked with a surprise switch to Anfield, by the Daily Mail, where current incumbent Simon Mignolet has come in for criticism this season.

One of the most sought-after free agents this summer is Barcelona rampaging right back Dani Alves.

The 32-year-old may be approaching the latter stages of his career, but the Brazilian is a player of undoubted class and is reportedly ready for a new challenge next season.

Manchester United, Chelsea and have been linked by sources such as Metro but he will almost certainly want to continue playing Champions League football, something he won't get at Anfield.

Italians very rarely venture to to England to play their trade, particularly defenders.

But Inter Milan's Andrea Ranocchia would be the perfect specimen to deal with the rigors of the Premier League. Standing at 6ft 5, the international centre back is an imposing figure and the 27-year-old has been linked with a move to Arsenal in the past.

When Ron Vlaar was tipped for a big-money move to Arsenal or Manchester United after an impressive World Cup for Holland it was a surprise to many that he stayed at Aston Villa for a season of struggle.

But perhaps the fact his contract was up this summer and he could be the master of his own destiny is the reason why.

Aged 30, the solid Premier League defender may be reunited at Old Trafford with his former Dutch national manager Louis van Gaal but has also been linked with a host of sides across Europe.

No transfer window is complete without a mention for giant centre-back Christopher Samba. The former Blackburn Rovers and Queens Park Rangers man has endured a tough few years in Russia after being transferred between that league and England three times for a grand total of nearly £37 million.

First he was sold by Blackburn to Anzhi Makhachkala in 2012 for £12.3 million before an ill-fated £12.5 million move back to the Premier League with QPR in January 2013. QPR were relegated and just six months later he was re-signed by Anzhi for £12 million.

In the left-back department Hamburg's Marcell Jansen could be chased by a number of clubs. He will be released at the end of the season as the German club look to cut their wage bill and the 29-year-old German, who can also operate as a winger, has been linked to the likes of Swansea this season by Wales Online.